20556544653 has 24 divisors (see below), whose sum is σ = 32806358208. Its totient is φ = 12337429632.

The previous prime is 20556544639. The next prime is 20556544681. The reversal of 20556544653 is 35644565502.

20556544653 is a `hidden beast` number, since 2 + 0 + 5 + 56 + 544 + 6 + 53 = 666.

It is not a de Polignac number, because 20556544653 - 2¹⁰ = 20556543629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20556544599 and 20556544608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20556542653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2917275 + ... + 2924312.

It is an arithmetic number, because the mean of its divisors is an integer number (1366931592).

Almost surely, 2^20556544653 is an apocalyptic number.

20556544653 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20556544653 is a deficient number, since it is larger than the sum of its proper divisors (12249813555).

20556544653 is a wasteful number, since it uses less digits than its factorization.

20556544653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5841633 (or 5841630 counting only the distinct ones).

The product of its (nonzero) digits is 2160000, while the sum is 45.

The spelling of 20556544653 in words is "twenty billion, five hundred fifty-six million, five hundred forty-four thousand, six hundred fifty-three".